SolarCity Corp. (SCTY) showed a rise of 7.1% in short interest to 7.33 million shares, or 30.2% of the company's float.

Trina Solar Ltd. (TSL) saw a short interest drop of 7.6% to 6.28 million shares.

Yingli Green Energy Holding Co. Ltd. (YGE) showed a rise of 19.4% in short interest to 13.6 million shares.

Short interest in Yingli has risen for the past three reporting periods. The reason is simple: the stock appears to be overvalued. The consensus price target is around $4.75 and the stock has not traded that low since early September. LDK showed a big jump in short interest as well, due largely to a 30-day forbearance agreement it arranged in late September postponing a $13 million interest payment. The extension ends on October 27.